Noah found a vine which was lying there, which had come out of the garden of Eden. It had its clusters with it, and he took of its fruit and ate, and rejoiced in his heart, as it is said, "My wine, which cheereth God and man" (Judg. 9:13). He planted a vineyard with it. On the selfsame day it produced and became ripe with its fruits, as it is said, "In the day of thy planting thou dost make it grow, and in the morning thou makest thy seed to blossom" (Isa. 17:11).
He drank wine thereof, and he became exposed in the midst of the tent, as it is said, "And he drank of the wine, and was drunken; and he was uncovered within his tent" (Gen. 9:21). Canaan entered and saw the nakedness of Noah, and he bound a thread (where the mark of) the Covenant was, and emasculated him. He went forth and told his brethren. Ham entered and saw his nakedness.
He did not take to heart the duty of honouring (one's father). But he told his two brothers in the market, making sport of his father. His two brothers rebuked him. What did they do?
They took the curtain of the east with them, and they went backwards and covered the nakedness of their father, as it is said, "And Shem and Japheth took a garment, and laid it upon both their shoulders, and went backward, and covered the nakedness of their father; and their faces were backward, and they saw not their father's nakedness" (Gen. 9:23).